1) City Planning, like everything else, is subject to fads and changing styles. It is my hope to only ever plan timelessly-- long lasting solutions for a changing population or demographic.
2) Wide streets and cul-de-sac, pod-like neighborhood developments are, in general, a detriment to the environment, public safety, and health. They eliminate the ability to walk, create excessive reliance on the automobile and encourage fast driving.
3) In Texas, for a developer to have vested rights in a property (should zoning laws change, etc.), all he needs is an incomplete building permit application.
4) City planning seems to be one of those professions where after you die, people tend to remember mostly all the things you did wrong.
5) To me city planning is especially interesting because it is the most interdisciplinary field I've ever encountered-- drawing from architecture, historic preservation, engineering, law, economics, sociology, psychology, and public policy (and probably more).
Okay there's five-- got to get working on a midterm for Planning Theory and History, but I'll finish up later.